The Lelantine Plain is a fertile plain on the Greek island of Euboea

Euboea

Euboea is the second largest Greek island in area and population, after Crete. The narrow Euripus Strait separates it from Boeotia in mainland Greece. In general outline it is a long and narrow, seahorse-shaped island; it is about long, and varies in breadth from to...

, between Chalcis

Chalcis

Chalcis or Chalkida , the chief town of the island of Euboea in Greece, is situated on the strait of the Evripos at its narrowest point. The name is preserved from antiquity and is derived from the Greek χαλκός , though there is no trace of any mines in the area...

 and Eretria

Eretria

Erétria was a polis in Ancient Greece, located on the western coast of the island of Euboea, south of Chalcis, facing the coast of Attica across the narrow Euboean Gulf. Eretria was an important Greek polis in the 6th/5th century BC. However, it lost its importance already in antiquity...

. In the late eighth century BC a dispute over its possession was the cause of the Lelantine War

Lelantine War

The Lelantine War was a long-remembered military conflict between the two ancient Greek city states Chalkis and Eretria in Euboea which took place in the early Archaic period, at some time between ca 710 and 650 BC. The reason for war was, according to tradition, the struggle for the fertile...

. In the Middle Ages it was known as Lilanto; a Venetian

Venice

Venice is a city in northern Italy which is renowned for the beauty of its setting, its architecture and its artworks. It is the capital of the Veneto region...

 document from 1439 describes a crisis caused by the powerful taking more than their share of the irrigation water:

and so many plots have remained unirrigated, and if things continue like this, the place Lilanto, which is the life of this island, will turn into a desolation - a place which provides more utility to the Signoria than any other, through being the eye and garden of Euboea.

It is presumably named for the Lelantos River (Ancient Greek

Ancient Greek

Ancient Greek is the stage of the Greek language in the periods spanning the times c. 9th–6th centuries BC, , c. 5th–4th centuries BC , and the c. 3rd century BC – 6th century AD of ancient Greece and the ancient world; being predated in the 2nd millennium BC by Mycenaean Greek...

 Λήλαντος), now the Lilas (Modern Greek

Modern Greek

Modern Greek refers to the varieties of the Greek language spoken in the modern era. The beginning of the "modern" period of the language is often symbolically assigned to the fall of the Byzantine Empire in 1453, even though that date marks no clear linguistic boundary and many characteristic...

Λίλας), which runs through it, though ancient scholiasts derived it from the name of an otherwise unknown king Lelantos.