THE BURNED OVER DISTRICT

And those that love it best build military bases there, first the United States and now China. And China is building right next door, like neighbors in a housing development.

With no shared border, China and the United States mostly circle each other from afar, relying on satellites and cybersnooping to peek inside the workings of each other’s war machines.

But the two strategic rivals are about to become neighbors in this sun-scorched patch of East African desert. China is constructing its first overseas military base here — just a few miles from Camp Lemonnier, one of the Pentagon’s largest and most important foreign installations.

With increasing tensions over China’s island-building efforts in the South China Sea, American strategists worry that a naval port so close to Camp Lemonnier could provide a front-row seat to the staging ground for American counterterror operations in the Arabian Peninsula and North Africa.

Established after the terror attacks of Sept. 11, 2001, Camp Lemonnier is home to 4,000 personnel. Some are involved in highly secretive missions, including targeted drone killings in the Middle East and the Horn of Africa, and the raid last month in Yemen that left a member of the Navy SEALs dead. The base, which is run by the Navy and abuts Djibouti’s international airport, is the only permanent American military installation in Africa.

Beyond surveillance concerns, United States officials, citing the billions of dollars in Chinese loans to Djibouti’s heavily indebted government, wonder about the long-term durability of an alliance that has served Washington well in its global fight against Islamic extremism.

Just as important, experts say, the base’s construction is a milestone marking Beijing’s expanding global ambitions — with potential implications for America’s longstanding military dominance.

“It’s a huge strategic development,” said Peter Dutton, professor of strategic studies at the Naval War College in Rhode Island, who has studied satellite imagery of the construction.

“It’s naval power expansion for protecting commerce and China’s regional interests in the Horn of Africa,” Professor Dutton said. “This is what expansionary powers do. China has learned lessons from Britain of 200 years ago.”

Chinese officials play down the significance of the base, saying it will largely support antipiracy operations that have helped quell the threat to international shipping once posed by marauding Somalis.

“The support facility will be mainly used to provide rest and rehabilitation for the Chinese troops taking part in escort missions in the Gulf of Aden and waters off Somalia, U.N. peacekeeping and humanitarian rescue,” the Defense Ministry in Beijing said in a written reply to questions.

Well, they do perform peace keeping functions so I guess your average Chinese swabbie would want someplace nearby for a little rest, a nice bowl of noodles and a few Tsingtao to wash it down. And it does so annoy the Pentgon brass when someone else builds a military facility next door.