[1] Positioned in the northern part of the province, Tulin Onsoi lies close to the border with Malaysia, contributing to its strategic significance in regional trade and cultural exchange.

The district is characterized by its diverse landscapes, which include forested areas, rivers, and mountainous terrain, reflecting the natural environment resources of North Kalimantan.

The economy of Tulin Onsoi is largely based on agriculture, with local residents cultivating crops such as rice, maize, and various vegetables.

Infrastructure in Tulin Onsoi includes roads, schools, and healthcare facilities, though development levels may vary between rural and more populated areas.

Tulin Onsoi faces challenges typical of remote districts, including infrastructure development, access to services, and economic diversification.