The most common and most likely answer to this crossword clue is the 7 letter word VALLEYS
I've seen this crossword clue in The Daily Telegraph
V
A
L
L
E
Y
S
More clues leading to the result VALLEYS
Buddy explains!

The straight part
We know that "Geographical features" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case geographical features = valleys.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does VALLEYS mean?
VALLEYS noun- An elongated depression between hills or mountains, often with a river flowing through it.
- The area which drains into a river.
- Any structure resembling one, e.g., the meeting point of two pitched roofs.
- The internal angle formed by the intersection of two sloping roof planes.