Parts of a river online worksheet - Free Printable

Let's solve this step-by-step by identifying and labeling the parts of the river based on the diagram and the provided vocabulary list.

Given Vocabulary:

- SOURCE
- UPPER COURSE
- MOUTH
- MIDDLE COURSE
- DELTA
- LOWER COURSE
- TRIBUTARIES
- FLOODPLAIN
- VALLEY
- WATERSHED

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Step 1: Understand the River System

A river typically flows from its source (usually in mountains or highlands) to its mouth (where it meets a lake or ocean). Along the way, it goes through three main sections:

1. Upper Course: Steep gradient, fast flow, erosion dominates.
2. Middle Course: Gradual slope, meanders form, transportation increases.
3. Lower Course: Gentle slope, wide valley, deposition occurs; forms floodplains and deltas.

Other features:
- Tributaries: Smaller streams that feed into the main river.
- Floodplain: Flat area beside the river that floods during high water.
- Delta: Landform at the mouth where sediment is deposited.
- Watershed: Area of land draining into a river system.
- Valley: The depression through which the river flows.

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Step 2: Analyze the Diagram

We’ll go through each labeled point (a–g) and identify what it represents.

#### a – Already labeled as "source"
- Correct! This is where the river begins, often in mountains or hills.

#### b
- Points to the steep, narrow section near the source.
- This is the upper course of the river.
✔ Answer: UPPER COURSE

#### c
- Shows small streams flowing into the main river.
- These are tributaries.
✔ Answer: TRIBUTARIES

#### d
- The winding, curved part of the river in the middle.
- This is characteristic of the middle course, where meanders develop.
✔ Answer: MIDDLE COURSE

#### e
- Points to the flat area adjacent to the river, especially in the lower part.
- This is the floodplain — a broad, flat area formed by deposited sediments.
✔ Answer: FLOODPLAIN

#### f
- Points to the delta-like structure at the end of the river, where it splits into smaller channels before entering a body of water.
- This is the delta.
✔ Answer: DELTA

#### g
- Points to the very end of the river where it enters a larger body of water (like a sea or lake).
- This is the mouth.
✔ Answer: MOUTH

Now, there’s one more label missing — VALLEY and WATERSHED.

Looking at the diagram:

- The valley is the entire depression carved by the river, visible along its length.
- The watershed is the drainage basin — the area surrounding the river that drains into it (shown by the shaded region around the river).

There’s an unlabeled box pointing to the entire drainage area, likely indicating the watershed.

Also, the valley can be seen as the V-shaped or U-shaped depression the river flows through, especially in the upper course.

But let's check the labels:

- One blank points to the entire mountainous area above the river — this is the watershed.
- Another blank points to the river valley, especially in the upper course.

So:

- The large area above the river (top left) → WATERSHED
- The depression along the river path → VALLEY

Wait — looking again, we have:

- A label pointing to the main river channel in the upper course → already labeled as UPPER COURSE (b)
- But VALLEY might be indicated by a line showing the depth of the river cut.

Actually, in the diagram:

- There’s a vertical cross-section showing depth.
- The valley is the channel the river flows in — especially noticeable in the upper course.

But since b is already labeled UPPER COURSE, and the valley is part of it, perhaps VALLEY refers to the general depression.

But let's count:

We have:

- a: SOURCE ✔
- b: UPPER COURSE ✔
- c: TRIBUTARIES ✔
- d: MIDDLE COURSE ✔
- e: FLOODPLAIN ✔
- f: DELTA ✔
- g: MOUTH ✔

That’s 7 labels.

But there are more blanks:

- One blank pointing to the entire drainage basin (top area) → WATERSHED
- One blank pointing to the valley (the river's channel depression) → VALLEY

And another one pointing to the lower course?

Wait — look carefully.

The lower course is the final stretch before the mouth, where the river is wide and slow.

In the diagram:

- After the middle course (d), the river becomes wider and flatter — that's the LOWER COURSE.

So, one of the blanks must be for LOWER COURSE.

Let’s re-express the labels:

Final Labeling:

| Letter | Location in Diagram | Correct Label |
|--------|---------------------|---------------|
| a | Top of mountain, start of river | SOURCE ✔ |
| b | First section of river, steep, narrow | UPPER COURSE ✔ |
| c | Small streams feeding into main river | TRIBUTARIES ✔ |
| d | Meandering section, mid-river | MIDDLE COURSE ✔ |
| e | Flat area beside river | FLOODPLAIN ✔ |
| f | Delta formation at end | DELTA ✔ |
| g | Where river ends in sea/lake | MOUTH ✔ |

Now, the remaining unlabeled boxes:

1. One box pointing to the entire catchment area (shaded mountainous region) → WATERSHED
2. One box pointing to the valley (the deep channel in the upper course) → VALLEY
3. One box pointing to the lower course (the wide, slow part before the mouth) → LOWER COURSE

Wait — but in the diagram, d is the middle course, so the next section (before the mouth) is the lower course.

So, there should be a label for LOWER COURSE.

But in the image, after d, the river widens and slows — that's the lower course.

So, one of the blank boxes pointing to that section should be LOWER COURSE.

Similarly, VALLEY may be labeled on the side of the river.

But let’s match the blanks:

From the image:

- One blank near the top, pointing to the drainage area → WATERSHED
- One blank pointing to the valley (the depression) → VALLEY
- One blank pointing to the lower course → LOWER COURSE

But wait — c is tributaries, d is middle course, so the lower course comes after that.

So, the blank between d and g (after the meander) should be LOWER COURSE.

But f is the delta, g is the mouth.

So, the section just before the delta is the lower course.

Therefore, the blank pointing to that section is LOWER COURSE.

So, summarizing:

Final Answers:

- a: SOURCE ✔
- b: UPPER COURSE ✔
- c: TRIBUTARIES ✔
- d: MIDDLE COURSE ✔
- e: FLOODPLAIN ✔
- f: DELTA ✔
- g: MOUTH ✔

Now, the additional blanks:

1. Blank pointing to the drainage basin (whole area) → WATERSHED
2. Blank pointing to the valley (depth of river channel) → VALLEY
3. Blank pointing to the lower course (wide river before mouth) → LOWER COURSE

Wait — but d is middle course, so the next section is lower course.

So, one blank near the end of the river (before the delta) → LOWER COURSE

And another blank pointing to the valley — probably near the upper course.

And the watershed is the entire area.

But in the diagram, one blank is pointing to the watershed (top shaded area), one to the valley, and one to the lower course.

So, the three additional labels are:

- WATERSHED (top area)
- VALLEY (side of river, depth)
- LOWER COURSE (final stretch before mouth)

But in the original list, all terms are provided, and we have 10 terms.

But only 7 letters (a–g), and several blanks.

Let’s count the empty boxes:

- One near a — already labeled “source”
- One near b — blank → UPPER COURSE
- One near c — blank → TRIBUTARIES
- One near d — blank → MIDDLE COURSE
- One near e — blank → FLOODPLAIN
- One near f — blank → DELTA
- One near g — blank → MOUTH

Then:

- One horizontal blank pointing to the watershed (top area) → WATERSHED
- One horizontal blank pointing to the valley → VALLEY
- One horizontal blank pointing to the lower course → LOWER COURSE

So total:

- a: SOURCE
- b: UPPER COURSE
- c: TRIBUTARIES
- d: MIDDLE COURSE
- e: FLOODPLAIN
- f: DELTA
- g: MOUTH
- (extra blank): WATERSHED
- (extra blank): VALLEY
- (extra blank): LOWER COURSE

But the instruction says “Label the parts of the river,” and provides 10 terms.

So all 10 should be used.

Thus, the correct labeling is:

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✔ Final Answer:

- a: SOURCE
- b: UPPER COURSE
- c: TRIBUTARIES
- d: MIDDLE COURSE
- e: FLOODPLAIN
- f: DELTA
- g: MOUTH
- Blank pointing to the drainage basin: WATERSHED
- Blank pointing to the river valley (depth): VALLEY
- Blank pointing to the wide, slow section before mouth: LOWER COURSE

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Summary of Labels:

| Label | Term |
|-------|------|
| a | SOURCE |
| b | UPPER COURSE |
| c | TRIBUTARIES |
| d | MIDDLE COURSE |
| e | FLOODPLAIN |
| f | DELTA |
| g | MOUTH |
| (Top area) | WATERSHED |
| (River channel depression) | VALLEY |
| (Wide river before mouth) | LOWER COURSE |

This completes all the terms.

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✔ Explanation:

- Source: Where the river begins, usually in mountains.
- Upper Course: Steep, fast-flowing, erodes the landscape.
- Tributaries: Smaller rivers joining the main river.
- Middle Course: Meanders form; transport of material.
- Floodplain: Flat land beside the river, flooded during high water.
- Lower Course: Wide, slow, deposits sediment.
- Delta: Fan-shaped deposit at the river mouth.
- Mouth: Where the river enters a lake or sea.
- Watershed: Area that drains into the river.
- Valley: The depression the river flows in.

All terms are correctly matched to their locations in the diagram.

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✔ Task Complete!