There are at least 100 species from over a dozen unrelated genera (a big chunk of the species are from the genus Palaquium) that have ekop as all or part of one or more of their common names and I have no idea which of them are represented on this page but they all appear to be native to Indonesia, India, Southeast Asia, the Philippines, and New Guinea.
my samples:
both sides of a sample plank of nyatoh / Palaquium spp.
end grain and end grain closeup of the piece directly above
web pics:
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