Why don't many people live in the Himalayan mountains and in the desert?

Many people do not live in the Himalayan mountains due to the harsh and extreme climate, which includes low temperatures, heavy snowfall, and difficult terrain that can make access to resources challenging. Similarly, deserts are characterized by arid conditions, scarce water supply, and extreme temperatures, making it difficult to sustain agriculture and provide basic necessities. These environmental factors contribute to the low population density in both regions. Additionally, the limited availability of infrastructure and services further discourages settlement in these areas.