Answer
The Watchtower search points to The Fort area, especially the northwest watchtower connected to Mika.
The watchtower search points to The Fort area. This site keeps the Mika/watchtower route in map and quest context rather than treating one screenshot as final.
If you are looking for the early cave-related route, check for Mika at the watchtower first, then use the map page for surrounding Fort context.
Do not treat a cropped screenshot as enough; use nearby named areas so you can return safely.