I was going off my failing memory of 20 years ago. Looking on the net, I’m guessing a Black Mamba didn’t swim from Africa to Taiwan! (BTW - never did see a snake there!)
From the nets:
Banded Krait
This colourful snake from South East Asia has a very potent neurotoxic venom. During the Vietnam War US soldiers referred to this snake as ” two step’” meaning if bitten you would walk two steps before dying. Us soldiers also referred to the Banded Krait as the ” cigarette snake” meaning you would die in the time it took to smoke a cigarette. Both these names are over-exaggerations.
Kraits are nasty, too. When my brother was in India many years ago, his guide prevented him from stepping on one.
Glad you didn’t have to deal with any. Snakes never seem to be around when you’re watching out for them, anyway. I live in Arizona and hike and hunt quite a bit, but I very seldom see rattlesnakes.