महाभारतः mahābhārataḥ - book-1, chapter-65, verse-30

शौचार्थं यो नदीं चक्रे दुर्गमां बहुभिर्जलैः ।
यां तां पुण्यतमां लोके कौशिकीति विदुर्जनाः ॥३०॥

30. śaucārthaṁ yo nadīṁ cakre durgamāṁ bahubhirjalaiḥ ,
yāṁ tāṁ puṇyatamāṁ loke kauśikīti vidurjanāḥ.

30. śaucārthaṃ yaḥ nadīṃ cakre durgamāṃ bahubhiḥ jalaiḥ
yāṃ tāṃ puṇyatamāṃ loke kauśikī iti viduḥ janāḥ

30. He (Viśvāmitra) who, for the sake of purification, created a river, made impassable by abundant waters—that very river which people in the world know as the most sacred Kauśikī.

Words meanings summery:

• शौचार्थं (śaucārthaṁ) - for the purpose of purification (for the purpose of purification, for purity's sake)

• यः (yaḥ) - who (Viśvāmitra) (who)

• नदीं (nadīṁ) - a river

• चक्रे (cakre) - created (a river) (made, created, did)

• दुर्गमां (durgamāṁ) - difficult to cross, impassable (difficult to cross, inaccessible)

• बहुभिः (bahubhiḥ) - by many (waters) (by many)

• जलैः (jalaiḥ) - by abundant waters (by waters)

• यां (yāṁ) - which (river) (which)

• तां (tāṁ) - that (river) (that)

• पुण्यतमां (puṇyatamāṁ) - the most sacred (the most sacred, most pure, most virtuous)

• लोके (loke) - in the world (in the world, among people)

• कौशिकी (kauśikī) - Kauśikī (name of the river) (Kauśikī)

• इति (iti) - so-called (thus, so, so-called)

• विदुः (viduḥ) - people know (know, understand)

• जनाः (janāḥ) - people

Words meanings and morphology

शौचार्थं (śaucārthaṁ) - for the purpose of purification (for the purpose of purification, for purity's sake)

(indeclinable)

Compound type : tatpuruṣa (śauca+artha)

• śauca – purity, cleanliness
  noun (neuter)
• artha – purpose, meaning, wealth
  noun (masculine)

यः (yaḥ) - who (Viśvāmitra) (who)

(pronoun)

Nominative, masculine, singular of yad

yad - which, who

नदीं (nadīṁ) - a river

(noun)

Accusative, feminine, singular of nadī

nadī - river

चक्रे (cakre) - created (a river) (made, created, did)

(verb)

3rd person , singular, middle, perfect (liṭ) of cakre

Perfect

Root: kṛ (class 8)

दुर्गमां (durgamāṁ) - difficult to cross, impassable (difficult to cross, inaccessible)

(adjective)

Accusative, feminine, singular of durgama

durgama - difficult to cross, inaccessible

Compound type : tatpuruṣa (dur+gama)

• dur – difficult, bad (prefix)
  indeclinable
• gama – going, moving
  noun (masculine)
  from √gam (to go)
  Root: gam (class 1)

बहुभिः (bahubhiḥ) - by many (waters) (by many)

(adjective)

Instrumental, plural of bahu

bahu - many, much

जलैः (jalaiḥ) - by abundant waters (by waters)

(noun)

Instrumental, neuter, plural of jala

jala - water

यां (yāṁ) - which (river) (which)

(pronoun)

Accusative, feminine, singular of yad

yad - which, who

तां (tāṁ) - that (river) (that)

(pronoun)

Accusative, feminine, singular of tad

tad - that

पुण्यतमां (puṇyatamāṁ) - the most sacred (the most sacred, most pure, most virtuous)

(adjective)

Accusative, feminine, singular of puṇyatama

puṇyatama - most sacred, most virtuous (superlative of puṇya)

लोके (loke) - in the world (in the world, among people)

(noun)

Locative, masculine, singular of loka

loka - world, people, realm

कौशिकी (kauśikī) - Kauśikī (name of the river) (Kauśikī)

(proper noun)

Nominative, feminine, singular of kauśikī

kauśikī - Kauśikī (name of a river, daughter of Kuśika)

इति (iti) - so-called (thus, so, so-called)

(indeclinable)

विदुः (viduḥ) - people know (know, understand)

(verb)

3rd person , plural, active, present (laṭ) of viduḥ

Present

Root: vid (class 2)

जनाः (janāḥ) - people

(noun)

Nominative, masculine, plural of jana

jana - person, people