SB 10.16.5

The word sthira, “unmoving creatures,” refers to various types of vegetation including trees, and jaṅgama refers to moving creatures such as animals, reptiles, birds and insects. Śrīla Śrīdhara Svāmī has quoted a further description of this lake from the Śrī Hari-vaṁśa (Viṣṇu-parva 11.42, 11.44 and 11.46):

dīrghaṁ yojana-vistāraṁ
dustaraṁ tridaśair अपि
gambhīram akṣobhya-jalaṁ
niṣkampam iva sāgaram
duḥkhopasarpaṁ tīreṣu
sa-sarpair vipulair bilaiḥ
viṣāraṇi-bhavasyāgner
dhūmena pariveṣṭitam
tṛṇeṣv अपि patatsv apsu
jvalantam iva tejasā
samantād yojanaṁ sāgraṁ
tīreṣv अपि durāsadam
“The lake was quite wide — eight miles across at some points — and even the demigods could not cross over it. The water in the lake was very deep and, like the immovable depths of the ocean, could not be agitated. Approaching the lake was difficult, for its shores were covered with holes in which serpents lived. All around the lake was a fog generated by the fire of the serpents’ poison, and this powerful fire would at once burn up every blade of grass that happened to fall into the water. For a distance of eight miles from the lake, the atmosphere was most unpleasant.”

Śrīla Sanātana Gosvāmī states that by the mystical science of jala-stambha, making solid items out of water, Kāliya had built his own city within the lake.