Dag is a village in the administrative district of Gmina Lukta, within Ostróda County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately south of Lukta, north-east of Ostróda, and west of the regional capital Olsztyn.

Dag, DaG, DAG, or dags may refer to:

• Dág, Hungary, a village
• Dag, a village in Poland
• DAG, the British National Rail station code for Dalgety Bay railway station, Scotland
• DAG, the IATA code for Barstow-Daggett Airport, California, USA
• Dag (lunar crater), a minor crater on the moon
• Dag (Callistoan crater)
• Dar al Gani, a meteorite field in the Libyan Sahara

Dág is a village in Komárom-Esztergom county, Hungary.

A mountain is a large landform that stretches above the surrounding land in a limited area, usually in the form of a peak. A mountain is generally steeper than a hill. Mountains are formed through tectonic forces or volcanism. These forces can locally raise the surface of the earth. Mountains erode slowly through the action of rivers, weather conditions, and glaciers. A few mountains are isolated summits, but most occur in huge mountain ranges.