Lassithi is the easternmost province of Crete. On three sides of the Lassithi washed by the sea: the Cretan Sea from the north, the Eastern Carpathian and the Libyan south. Western District of Heraklion is the natural limit of the mountain range Dikti.Protefousa Lassithi Prefecture is Agios Nikolaos. In Lasithi are three major urban centers, Agios Nikolaos, Ierapetra, which is the most populous city of the prefecture and Sitia.

The terrain is mostly mountainous, with mountains Dikte (or Lassithi mountains) that dominates the limits of the prefectures of Heraklion and Lassithi, occupying entirely the province of Lasithi provinces and part of Mirabello and Ierapetra. A second ridge, the Steiaka Mountains, located east of the county.

Valleys with olive trees are in Ierapetra and Naples and other smaller among the mountains, often close to the coast.

There are two plateaus, the most famous Lassithi Plateau and the Canyons of the Net enough much more that of Ha (the 24th km Agios Nikolaos - Ierapetra on the slope Papouri).

The coastline of Lasithi is varied with a large bay (Mirabello), a lagoon (St. Nicholas Voulismeni) wide beaches, large and small ports in the north (Elounda, Sitia, Poros Faneromenis) ports Grande, Karoumbas Zakros and west and south Makrigialos and Kala Nera.

The islands belonging to the county are many and interesting, each in its own grounds. Spinalonga, the Venetian island fortress used as a gathering place and the Hansen (lepers), the "Aghioi Pantes"who is a refuge for Cretan wild goat (Kri Kri), the Gourd, the lice, the Dionysus with ancient findings, Elasa, Koufonisi, Xrysi with a native species of cedar, etc.