Prime Minister Abdullah bin Nasser bin Khalifa Al-Thani and commander of US Naval Forces in the Middle East Vice Admiral Jim Malloy attended the ceremony at the Al-Daayen naval base in Semaisima, 30 kilometres from Doha on Qatar’s eastern coast.
Qatar, a key US ally in the region, is home to Washington’s largest Middle East military base.
Malloy, commander of the US Fifth Fleet based in Bahrain, said the new base was “a wonderful opportunity for us to interface more strongly with the Qatari coast guard”.
Tensions in the Gulf — through which nearly a third of the world’s oil is transported — have spiked in recent weeks, with the US blaming Iran for multiple attacks on tanker ships in the region and Tehran shooting down an American drone.
The 600,000-plus square-metre site aims to “facilitate the securing of all territorial waters of the State and border posts”, the interior ministry wrote on Twitter.