95 percent of its eligible population. Bhutan last month suspended entry for foreign workers, after experts cited concerns about laborers coming from India.

The border between Pakistan and India was closed even before the pandemic because of political tensions. But in Pakistan, too, cases are rising. Asad Umar, the official leading its coronavirus response, cited the fact that “the entire region is exploding with cases and deaths” to explain new lockdowns.

coronavirus response plan last May, it estimated that local facilities would be insufficient if there were more than 5,000 active cases at once. Now there are more than 100,000.

For many Nepalis, anger and sorrow have mixed with utter helplessness.

Pramod Pathak, a businessman in the border district of Kailali, has watched in anxiety and sorrow as migrant workers returned from India. They have crowded every day into overwhelmed testing centers, or — for the many for whom there are no tests — simply crammed into shared cars and returned to their villages.

“The virus is transmitting as they travel in jam-packed vehicles,” Mr. Pathak said. “There’s no safety for them no matter where they go — be it India or Nepal.”

Bhadra Sharma reported from Kathmandu, Nepal; Aanya Wipulasena from Colombo, Sri Lanka; and Vivian Wang from Hong Kong. Julfikar Ali Manik contributed reporting from Dhaka, Bangladesh, and Chencho Dema from Thimphu, Bhutan.

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