The four-star 207-room hotel, wholly owned by Kedah government subsidiary Permodalan Kedah Berhad and managed by PKB Management and Services Sdn Bhd, started operating on Jan 15 last year.
It has separate swimming pools for men and women, a restaurant, gymnasium, spa and meeting hall, among other facilities.
Members of the Kedah Council of Regency, the Raja Di-Hilir of Perak, Raja Datuk Seri Iskandar Dzulkarnain ibni Almarhum Sultan Idris, and Kedah Menteri Besar Datuk Seri Ahmad Bashah Md Hanipah were among those present at the event.
Ahmad Bashah, in his speech, said Adya Hotel Langkawi was developed in an effort by the state government to increase the number of hotel rooms on the island. He said Langkawi needed at least 10,000 hotel rooms to meet demand from the rising number of tourists.
He also said that Adya Hotel Langkawi obtained halal certification from the Department of Islamic Development (Jakim) last November and had received rave reviews from tourists.
As of March 31, the hotel has had 133,802 guests, he said.
"On the average, occupancy is 72 per cent ... guests come from all over the world and the high percentages are from China, the Middle East and Europe," he said.
The hotel has already won awards, such as the Langkawi International Tourism Award 2015 for four-star hotels, Guest Review Award for Excellent Service 2015 from Booking.com, Islamic Quality Standard Rating from Universal Crescent Standard Centre Malaysia, Excellent Guest Review Score 2016 from Hotels.com and Choice Hotel of four-star category 2015 from Tripadvisor.com.