This statue of King Sisowath is located at the Wat Phnom temple in Phnom Penh. Built in 1373, it is the tallest religious structure in the city, and also serves as the central point of Phnom Penh.
Sisowath is a relatively recent King, holding his title from 1904 until his death in 1927. This monument commemorates the return of three of Cambodia's provinces (Preah Vihear, Battambang, and Siam Reap) in 1907 from Thailand under pressure from the French. In general, the border between Thailand and Cambodia is quite contentious and a source of continued tensions.
For being smack-dab in the center of the city, this was fairly low-key and not mobbed with people whatsoever.