We can talk about tall people, trees, and sometimes buildings.
- How tall are you?
There are some beautiful tall trees at the end of our garden.
We do not use tall for things which are this shape:
We use high.
- Mont Blanc is the highest mountain in Europe.
(NOT . . . the tallest motmtiin.)
It’s a very high room. (NOT . . . tall room.)
- She’s got beautiful long legs. (NOT…tall legs)