The oldest language of the region of Mesopotamia was Sumerian. Sumerian is considered to be the world's oldest written language and was spoken in southern Mesopotamia (modern-day Iraq and Kuwait) around 4000 BCE.

Sumerian Writing System:
Sumerian writing system was known as cuneiform. It was one of the earliest writing systems in the world and involved the use of wedge-shaped marks made on clay tablets. These tablets were then dried or baked to preserve the information. The Sumerians used cuneiform to record various aspects of their society, including legal codes, religious texts, and historical accounts.

Key Features of Sumerian Language:
1. Agglutinative Language:
Sumerian was an agglutinative language, meaning that words were formed by combining root words with various prefixes, suffixes, and infixes. This allowed for the creation of complex words and grammatical structures.

2. Verb-Subject-Object Word Order:
In Sumerian, the word order was typically verb-subject-object (VSO), which is different from the subject-verb-object (SVO) word order commonly found in modern English.

3. Extensive Vocabulary:
Sumerian had a vast vocabulary, including terms related to agriculture, trade, government, religion, and more. It was a highly developed language that allowed for precise expression of ideas.

4. Influence on Later Languages:
Sumerian had a significant impact on the development of other languages in the region. Akkadian, a Semitic language, borrowed extensively from Sumerian, including its writing system. Sumerian loanwords and grammatical features can also be found in later languages like Babylonian and Assyrian.

Legacy of Sumerian Language:
Despite its decline as a spoken language, Sumerian continued to be used as a written language for centuries. Its influence on the region's culture, religion, and literature persisted long after it ceased to be the primary spoken language. The study of Sumerian texts has provided valuable insights into the history, mythology, and daily life of the ancient Mesopotamians.

In conclusion, Sumerian was the oldest language of the Mesopotamian region. Its development and use marked a significant milestone in the history of human communication, and its influence can still be seen in the languages and cultures of the region today.

Sumerian