Shanti Path Mantra

ॐ द्यौ: शान्तिरन्तरिक्षँ शान्ति:,
पृथ्वी शान्तिराप: शान्तिरोषधय: शान्ति:।
वनस्पतय: शान्तिर्विश्वे देवा: शान्तिर्ब्रह्म शान्ति:,
सर्वँ शान्ति:, शान्तिरेव शान्ति:, सा मा शान्तिरेधि॥
ॐ शान्ति: शान्ति: शान्ति:॥

Om Dyauh Shantirantariksham Shantih
Prithvi Shantirapah Shantih
Oshadhayah Shantih Vanaspatayah Shantih
Vishvedevaah Shantih Brahma Shantih
Sarvam Shantih Shantireva Shantih
Saamaa Shantiredhih
Om Shaantih, Shaantih, Shaantih!

Meanings from greenmesg.org

ॐ (Om): Symbol of Parabrahman

द्यौः (Dyauh): [Peace is in] Sky or Heaven
द्यु (Dyu) = Sky, Heaven

शान्तिरन्तरिक्षं (Shaantir-Antarikssam): Peace [is in Sky or Heaven], [Peace is in] Space [between Earth and Sky]
शान्ति (Shaanti) = Peace
अन्तरिक्ष (Antarikssa) = Space between Earth and Sky

शान्तिः (Shaantih): Peace
शान्ति (Shaanti) = Peace

पृथिवी (Prthivii): [Peace is in] Earth
पृथिवी (Prthivii) = Earth

शान्तिरापः (Shaantir-Aapah): Peace [is in Earth], [Peace is in] Water
शान्ति (Shaanti) = Peace
आपः (Aapah) = Water

शान्तिरोषधयः (Shaantir-Ossadhayah): Peace [is in Water], [Peace is in] Plants
शान्ति (Shaanti) = Peace
ओषधि (Ossadhi) = Herb, Plant
ओषधयः (Ossadhayah) = Herbs, Plants

वनस्पतयः (Vanaspatayah): [Peace is in] Trees
वनस्पति (Vanaspati) = Tree
वनस्पतयः (Vanaspatayah) = Trees

शान्तिर्विश्वेदेवाः (Shaantir-Vishvadevaah): Peace [is in Trees], [Peace is in] Gods [presiding over the elements of Nature]
शान्ति (Shaanti) = Peace
विश्वेदेवाः (Vishvedevaah) = Gods [presiding over the elements of Nature]

शान्तिर्ब्रह्म (Shaantir-Brahma): Peace [is in Gods], [Peace is in] Brahman
शान्ति (Shaanti) = Peace
ब्रह्म (Brahma) = Brahman, Absolute Consciousness

सर्वं (Sarvam): [Peace is pervading] everywhere
सर्व (Sarva) = All, Whole, Entire

शान्तिरेव (Shaantir-Eva): Peace alone [outside is in Peace inside]
शान्ति (Shaanti) = Peace
एव (Eva) = Alone, Only, Indeed

सा (Saa): She

मा (Maa): Me

शान्तिरेधि (Shaantir-Edhi): May you be [established in] that Peace
शान्ति (Shaanti) = Peace
अस् (As) = To be
एधि (Edhi) = May you be

May peace radiate there in the whole sky as well as in the vast ethereal space everywhere.
May peace reign all over this earth, in water and in all herbs, trees and creepers.
May peace flow over the whole universe.
May peace be in the Supreme Being Brahman.
And may there always exist in all peace and peace alone.
Om Shanti, Shanti, Shanti to us and all beings!

Variant translation of the Mantra

शान्ति: कीजिये, प्रभु त्रिभुवन में, जल में, थल में और गगन में
अन्तरिक्ष में, अग्नि पवन में, औषधि, वनस्पति, वन, उपवन में
सकल विश्व में अवचेतन में!
शान्ति राष्ट्र-निर्माण सृजन में, नगर, ग्राम में और भवन में
जीवमात्र के तन में, मन में और जगत के हो कण कण में
ॐ शान्ति: शान्ति: शान्ति:॥