en_tn/gen/13/16.md

walk through the length and breadth of the land

This can be translated as "walk around all over the whole land."

oaks

See how you translated “oak” in Genesis 12:6.

Mamre

This was the name of the man who owned the oak trees.

an altar to Yahweh

"an altar dedicated to Yahweh" or "an altar for worshiping Yahweh"