(Adds survivor, details)

BANGKOK, Oct 14 (Reuters) - Eight people, including four Swedish tourists and a 10-year-old German boy, drowned when a flash flood trapped them in a cave in southern Thailand, but a British woman survived, officials said on Sunday.

One other foreign tourist, whose identity and nationality were not immediately known, was among those drowned in the 500 metre (1,640 ft) deep Nam Talu cave in the Khao Sok national park along with a Thai tourist guide and a boatman, they said.

But a 17-year-old British woman was found alive after a long search that began on Saturday night, park official Thirayudh Mungpaisal told Reuters.

"We found her in the cave, at the top part of the cave. We guess that the water pushed her up there and she couldn't get down," he said.

The woman was slightly injured and recovering in hospital, he said, declining to give names.

Police Lieutenant Colonel Pichan Kalayasiri told Reuters by telephone from Surat Thani province, where the forested park draws trekkers and bird watchers, that the dead included a German boy aged 10.

The cave on the Rachaprpa reservoir is home to bats.

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