Nepal, Nov. 4 -- In October, tourist arrivals from India, traditionally Nepal's largest tourism source market, fell 30 percent, year on year. The decline is particularly concerning because the neighbouring country offers Nepal one of its most accessible and sustainable tourism markets. At a time when geopolitical tensions, particularly the war in West Asia, threaten international travel patterns, India represents an enormous opportunity. The two countries share cultural, religious and linguistic ties, have an open border and enjoy relatively easy connectivity. Nepal does not need to spend heavily convincing Indian travellers to discover an unfamiliar destination. It needs to make their journey safe, affordable and convenient.

But that is...