Given the task definition and input, reply with output. You are given a sentence and a question in the input. The information provided in the sentence should be enough to answer the question. You're expected to write the correct answer. Do not use any facts other than those provided in the sentence.

Sentence: 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). 
Question: How large is Kathmandu in terms of square miles?

19.56 square miles.