One vegetable that starts with "tur" is turnip.
Both TURKEY and TURKMENISTAN qualify as Asian countries that start with "Tur". However, Turkmenistan is the only country of those two that is wholly in Asia.
There are only two countries that begin with 'tur', one is Turkmenistan, which is considered to be in Asia; and Turkey, considered to be Eurasian. Perhaps you were thinking of Tunisia in northernmost Africa.
Turbine.
Turku
Turkana
toronto
Turin
That would be Turku
"Turn" as is turn the wheel.
turquoise
turkey