ATLANTIC CITY - Two of Atlantic City's top casinos are reinvesting tens of millions of dollars into their gambling areas, hotels and entertainment venues.

The Tropicana on Thursday announced a $25 million renovation that will re-do 500 hotel rooms, a casino area, eateries and its outdoor multimedia light show.

That announcement comes two days after the Borgata announced it is spending $50 million on projects this year, including an outdoor pool where its short-lived Borgata Festival Park was last year.

The Borgata's projects include a new nightclub and new meeting and conference space.

The investments are seen as essential to surviving and thriving in the cutthroat gambling market in Atlantic City and the northeastern U.S.

These two casinos have been among the most diligent about reinvesting in their properties lately.