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Mauremys leprosa
Tortuga is the Spanish generic name and covers Turtles, Terrapins and Tortoises. From what I can see they have feet, not flippers so are not Turtles. My guess is the shells may be about 6" across and 8" long.
Leaving a lake and climbing into a reed bed. I think the lake is freshwater as it is isolated from the sea but it may be brackish.
Thanks Neil, I will look into this on my return from the Bornea jungle in March.