He spent time traveling around in Arabia and through that was able to develop the position of the director of communications with Arab tribes and their 'shaykhs'.
Has in charge of landing of the British delegation at the Gulf of Antioch and assembling of two steamers, brought from England in parts and ultimately their launch on the Euphrates.
After the sinking of the Tigris and the loss of his brother, Lynch returned home in August/September 1836, traveling via Mosul, Iraq and Trabzon, Turkey.
He surveyed the trigonometric of Mesopotamia in 1841, whilst also establishing a postal service between Baghdad and Damascus with his brother Thomas Kerr Lynch.
They had 4 children: Quested Finnis; Rose; Alice Harriet, whose husband was Count Adolf Wilhelm von Kessler; and Caroline Lynch.