Dear lord, it is a basemap.
That's horrifying.
And have it here bigger in all its full weirdness:
What's especially striking (apart from the glaring errors) is the varying level of detail.
For Example Japan, New Guinea and Australia are very detailed, Indonesia and the Philippines are kinda meh (wouldn't be bad but being right next to the obviously more detailed islands the difference is obvious) but still better than the mainland Asia coastlines; much of Vietnam's and China's coast seem to have been just made with a drawing compass (and where they ended using that compass and started doing it by hand they didn't even erase the overlapping bits) although given how Kamchatka ended up looking the parts where they used that compass aren't even the worst...