European grouping of territorial cooperation TRITIA, Ltd.

Opole Voivodeship

Area: 9,412.5 km2
Population: 1 044,346
Regional seat: Opole

Moravian-Silesian Region

Area: 5,426.8 km2
Population: 1 260, 503
Regional seat: Ostrava

Silesian Voivodeship

Area: 12,333.1 km2
Population: 4 620,624
Regional seat: Katowice

Žilina Self - governing Region

Area: 6,808.7 km2
Population: 690,121
Regional seat: Žilina