(CNN) -- [Updated 3:30 p.m. Monday, September 17] A Japanese flotilla arrives at a group of disputed islands in the East China Sea.
In April, the governor of Tokyo launched an online fundraising effort to buy the Senkaku islands, or Diaoyu as they're known in China, from their private owners.
China, however, says it has laid claim to the islands "since ancient times."
"The willful talk and action of some Japanese politicians is irresponsible and tarnish and smears Japan's reputation," Chinese Foreign Ministry spokesman Liu Weimin said in June.
The Japanese government intervened with its own bid on the islands, confirming last week that it had approved the purchase for 2.05 billion yen ($26.2 million). That sparked anti-Japanese protests in dozens of Chinese cities.
When it comes to China's relations with Japan, history runs deep and often venomous, said CNN's Stan Grant. The islands symbolize what many in China see as unfinished business, redressing the impact of Japanese occupation in the 1930s and 1940s.
Japan says China ceded sovereignty of the islands when it lost the Sino-Japanese war in 1895. The islands were administered by the U.S. after World War II, but in 1972 Washington returned them to Japan as part of its withdrawal from Okinawa. Click here for a more in-depth breakdown of the controversy.
Congrats to CNN.com readers "Grant" and "titus vicente" for being the first to guess correctly in this week's photo challenge.
[Original post] Do you know where this photo was taken?
If you think you know the answer -- or if you just want to take a wild guess -- post it in the comments area below. Later in the day, we'll reveal where the photo was taken and give credit to those who figured it out first. (The more detail, the better!)
Each Monday morning, we'll post a new photo and challenge you to tell us its origin. The photo might be related to a prominent news story or theme -- or it might just be something that caught our eye.
CNN's Hilary Whiteman and Stan Grant contributed to this report.