onamo

1. formal (of direction) there; that way
   Ti idi ovamo, a ja ću onamo. — You go this way, and I'll go that way.
   Ceo dan je šetao ovamo-onamo. — He was pacing back and forth all day.
2. formal (of place) there; over there
   Kuća mu je onamo, iza brda. — His house is over there, beyond the hill.

In everyday speech people say "tamo"; "onamo" appears mostly in "ovamo-onamo" (back and forth).