This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

Kathmandu is located in the northwestern part of the Kathmandu Valley to the north of the Bagmati River and covers an area of 50.67 km2 (19.56 sq mi). The average elevation is 1,400 metres (4,600 ft) above sea level. The city is directly bounded by several other municipalities of the Kathmandu valley: south of the Bagmati by Lalitpur Sub-Metropolitan City (Patan) with which it today forms one urban area surrounded by a ring road, to the southwest by Kirtipur Municipality and to the east by Madyapur Thimi Municipality. To the north the urban area extends into several Village Development Committees. However, the urban agglomeration extends well beyond the neighboring municipalities, e. g. to Bhaktapur and just about covers the entire Kathmandu valley.
What river is south of Kathmandu?