1		Thai endemic, possibly, to city on Trans-Canada highway (8,3)
9		Main location of the Cayman Trench (9)
10		Pointless yellow-brown Italian province (5)
11		Expresses annoyance with one minority African group (5)
12		USA tries energy generating coastal waters (9)
13		Siam once had Latin exchange (8)
15		Nile turbulent on returning warm ocean surge (2,4)
17		Top of snow shelf form of transport (6)
19		Hard going for this sort of sailing craft? (3,5)
22		Natalie's upset about university getting volcanic archipelago in Pacific (9)
23		Describe Nineveh: in part a Nigerian province (5)
25		Ancient Brits, eastern, northern held inside here in France (5)
26		Malmo set right excited by Norwegian whirlpool (9)
27		They're the highest in S.Africa — from which luge at resort drops? (6,5)

1		Connemara, thankfully, is host to a western Indian (7)
2		Provide soundtrack (first class) for United Arab emirate (5)
3		American Indian sounds a bit like a bashful girl (8)
4		Northants. river and back street nomadic Arctic Russians (6)
5		The sly man disguised as African explorer (1,1,7)
6		Dime hit badly in hinterland of S. France (3,4)
7		Famous explorer has no time for this northerner (4)
8		Traveller's permit to overtake on left? (8)
13		Old Soviet news agency endlessly has obsession for this island (8)
14		Weather phenomen producing illumination round North (9)
16		Perhaps the Ross one in Antarctica – on which a thief's diamonds might be put? (3,5)
18		High peak's severe, fluctuating temperature (7)
20		Against southern right-wing guerillas (7)
21		Massachusetts 2000: one left duck- billed platypus, famously (6)
23		British Airways South upset the French in Swiss town (5)
24		Despised Swiss banker topless in a province of modern Greece (4)