How many letters does the top answer for “a point located with respect to surface features of some region” have?

The most common answer is place (5 letters).

Crossword clue: a point located with respect to surface features of some region

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

place 5 letters wn-def

put into a certain place or abstract location

spot 4 letters wn-def

a point located with respect to surface features of some region