Final answer:
Costa Rica is the country that has the mentioned mountain ranges and volcanoes. Arenal Volcano is one of the most active in the world.
Step-by-step explanation:
The country that has the Dordillera De Tilaran, Cordillera Guanacaste, Cordillera De Talamanca, Arenal Volcano, Irazu, and Poas is Costa Rica.
These geographical features are part of the larger mountain range system in the country. The Cordillera De Talamanca is the highest range in Costa Rica and includes the highest peak, Cerro Chirripo.
Arenal Volcano is one of the most active volcanoes in the world, regularly erupting and attracting tourists from around the globe.