Erg (landform) when liquid methane rained and eroded the ice bedrock, possibly in the form of flash floods. Alternatively, the sand could also have come from organic solids produced by photochemical reactions in Titan's atmosphere. Erg (landform) An erg (also sand sea or dune sea, or sand sheet if it lacks dunes) is a broad, flat area of desert covered with wind-swept sand with little or no vegetative cover. The term takes its name from the Arabic word "ʿarq" (), meaning "dune field". Strictly speaking, an erg is defined as a desert area that contains more than of aeolian or wind-blown sand
Liwa (Arabic) known as "Liwa' Iskenderun". Liwa (Arabic) Liwa, or Liwā’ (), is an Arabic term meaning ensign, or banner. The word has developed various other meanings in Arabic: "Liwa" was used interchangeably with the Turkish term "Sanjak" in the time of the Ottoman Empire. After the fall of the empire, the term was used in the Arab countries formerly under Ottoman rule. It was gradually replaced by other terms like qadaa and mintaqa and is now defunct. It is only used occasionally in Syria to refer to the Hatay Province, ceded by the French mandate of Syria to Turkey in 1939,