brown stream, caused by natural leaching of nothofagus plants, at scotts beach, heaphy track, karamea

wood karamea west coast zealand south island tree branch plant spring trunk leaf growth green lush heaphy track maori native moss lichen cover bush fern folliage rock limestone stream brown river tannin forest natural accumulation leached bark nothofagus species litter humus pebble sea tasman beach wave water caused leaching plants scotts