Salwa is a kingdom grouped among the western kingdoms in the epic Mahabharata. It was close to Madra Kingdom as both are mentioned together in many places. Saubha was its capital. Martikavati also was mentioned as the capital of Salwa kingdom. The famous prince Satyavan was from Salwa. He married the Madra princess, Savitri, the daughter of Madra king Aswapati. Their history is a famous narration in Mahabharata. Seven chapters 3:291 to 3:297 is dedicated to this history of Satyavan and Savitri.

Madra Kingdom was a kingdom grouped among the western kingdoms in the epic Mahabharata. Its capital was Sagala in Madra region, modern Sialkot in the Punjab province of Pakistan. The Kuru king Pandu's (Pāṇḍu) second wife was from Madra kingdom and was called Madri. The Pandava twins, Nakula and Sahadeva, were her sons. Madri's brother Shalya was the king of Madra. Though affectionate to the Pandavas, he was tricked to give support to Duryodhana and fought against the Pandavas during the Kurukshetra War. He was killed by Yudhishthira, the eldest Pandava. Other than the Madra kingdom with Sagala as its capital, it is believed that there was a Western Madra and a Northern Madra.