Lower Siang is a district located in the state of Arunachal Pradesh, India. It is situated in the western part of Arunachal Pradesh and is bordered by the districts of West Siang and East Siang. The district was officially established on August 15, 2019, after being carved out from the West Siang district.

Lower Siang district is known for its natural beauty and picturesque landscapes. It is surrounded by hills, rivers, and dense forests, making it a haven for nature lovers and adventure enthusiasts. The mighty Siang River flows through the district, providing opportunities for various water activities like boating, rafting, and fishing.