WASHINGTON — Quick: Cochabamba is the third-largest conurbation in what country?

Your answer might be, “Huh?” But 11-year-old Akshay Rajagopal answered “Bolivia” to clinch the 20th annual National Geographic Bee on Wednesday.

A conurbation is a large, densely populated urban area — and Cochabamba is the third-largest one in the South American country.

Akshay’s correct answer capped a two-day event in which he got every question right. A sixth-grader at Lux Middle School in Lincoln, Neb., he won a $25,000 scholarship.