# Geber ... Uri ... Sihon ... Og

These are men's names 

# in the land of Gilead

"who was the officer in charge of the land of Gilead"

# Gilead ... Bashan

These are names of places.

# the country of Sihon

"the land that in earlier years belonged to Sihon"

# Amorites

This is the name of a people group. 

# in the land

"the land" refers to the land of Judah; the previous officials presided over different parts of Israel.