Lymph from the right leg ultimately is delivered to which duct in the thoracic region?

The answer is thoracic duct/left lymphatic duct.

There are two ducts where lymph vessels connect to and drain lymph. The right lymphatic duct drains the right arm, right side of the trunk, head and neck. The thoracic duct drains all other areas of the body, which includes both legs. 

The "lymph" from the "right leg" is delivered to the "thoracic duct" in the thoracic region.

Explanation:

A white fluid called 'lymph' that consists of white blood cells is created in the lymphatic capillaries through the process of filtration of interstitial fluid. It is then delivered to the thoracic duct from where it is siphoned into the bloodstream. The lymph helps the body in fighting disease-causing bacteria and cancerous cells. It also helps in neutralizing and draining out toxic substances from the body.

Answerhaiti, zambia;