Skandapurana 1.3.15.95

1.3.15.95

yasminvane mahābhāga na saṃti ca ṣaḍūrmayaḥ..
tasmāccaitrarathaṃ nāma vanaṃ paramamaṃgalam..
tasya rājñaḥ śivenaiva dattaṃ yānaṃ mahādbhutam.. 17.95 ..

In which forest, O fortunate one, the six waves [of existence] do not exist; / therefore it is named Caitraratha, a most auspicious forest. / To that king a wondrous vehicle was given by Śiva himself,