Where is the Summer Kingdom in the Western Regions now?

Summer in the Western Regions is the Afghan region west of Pamir.

The kingdom of Bactria (about 256 BC-256 BC 145 BC) was a slave country established by Greek colonists in Central Asia in the middle of the 3rd century BC (located in the west of Pamirs in the northwest of Qinghai-Tibet Plateau, that is, in Afghanistan west of Pamirs). The capital is located in Baktra (now Balkh, Afghanistan).

Agriculture:

During the kingdom of Bactria, agriculture and animal husbandry in Central Asia developed rapidly, planting wheat, rice and grapes. Fergana Valley is famous for producing fine horses. Immigrants from Greece, Macedonia and Asia Minor reclaimed land and built water conservancy projects on a large scale.

After the 3rd century BC, the urban economy flourished. Among them, the most important cities are Alexandria in Marguillard, Marcand in Sogdia, Antioch in Fergana, Bamyan and Begram in northern Afghanistan.

Refer to the above? Baidu Encyclopedia-Summer