The Arabic word Dar, meaning abode, house, dwelling, habitation, land, country is combined with many other terms to specify a locality where a certain rule or condition holds.
By far the most important is the division of the world in DARU 'L-ISLAM and DARU 'L-HARB.
In the following some further concepts, some classical, some of them modern:
The Daru 'l-'Ahd is a means by which Muslims can solve the dilemma that they have created for themselves through migration and immigration: how can one live as a true Muslim while living in a non-Islamic state? The Dar al-'Ahd is a non-Muslim state in which there is an agreement between Muslims and non-Muslims that each must respect the other's right to practice their own religion. (Source)
However, lasting peace is always a peace where the Muslims dictate the conditions, note The Islamic Concept of Peace. It would be more correct to translate sulh as truce or armistice in this context. Classical Islamic law only knows the division in the area where Islam rules and the area that is not yet subjugated to Islamic rule, called Daru 'l-Harb. Permanent peace treaties with unbelievers are considered invalid. It is the command of Allah that the believers should fight until Islam rules supreme. A truce is only an option as long as the Muslims are not yet strong enough to win a war and become dominant.
Further reading: