ANKARA, July 25 (Reuters) - Turkish President Tayyip Erdogan on Tuesday described his trip to the Gulf to deal with the Qatar crisis as "productive and successful", following two days of talks that appeared to yield no immediate progress towards healing the rift.

"The visits on the Gulf tour were productive and successful," Erdogan told lawmakers from his ruling AK Party at a parliamentary meeting.

"The contacts we have made during this visit have been useful, and we will continue our efforts for the stability and peace of the region with increasing determination."

Erdogan left Qatar on Monday after two days in the Gulf trying to mediate in the worst row among Arab states for years but there was no sign he had made any progress. Turkey has been Qatar's most powerful ally in the dispute.

(Reporting by Daren Butler and Tuvan Gumrukcu; Writing by David Dolan; Editing by Dominic Evans) ((david.dolan@tr.com; +90 212 350 7046; Reuters Messaging: david.dolan.thomsonreuters.com@reuters.net))