The Sakae Krang River is a tributary of the Chao Phraya River. It originates in Mae Wong National Park, Nakhon Sawan Province. It is 225 kilometres (140 mi) long, with most of its length in Uthai Thani Province. It joins the Chao Phraya River in Uthai Thani city near Wat Tha Sung (Tha Sung Temple). The Sakae Krang is part of the Chao Phraya Watershed. The total land area drained by the Sakae Krang River is 5,191 square kilometres (2,004 sq mi). Main tributaries of the Sakae Krang River include Huai Thap Salao and Khlong Pho.
According to the Tourism Authority of Thailand, the people of Uthai Thani use the Sakae Krang River to grow pandanus and to raise fish in floating baskets, which is the primary occupation of the Uthai Thani people.
In 2011, after high rainfall and poor flood control management, much of the Sakae Krang River overflowed its banks between September to November that year. The main riverside market in Uthai Thani City was under up to 160 centimetres (5 ft) of water for over seven weeks. The new market a few kilometers away was also severely flooded for almost as long.

Source: Wikipedia